User sees error response on update of setSearchIdleAfter index setting for segrep and remote store indexes

[ashking94]

Is your feature request related to a problem? Please describe.
SearchIdle feature only works for single replica for segrep indexes. For remote store, search idle feature is not supported. This is being removed in #10761. As part of this https://github.com/opensearch-project/OpenSearch/pull/10761/files#r1366872771, we should ensure that we fail these update index settings. We need to handle below cases -

• If user passes searchIdle setting with value during index creation, it fails too.
• When the update index setting happens with multiple other settings, does it fail the update entirely or the setting update happens partially.
• Need to handle both segrep and remote store.

[andrross]

[Triage - attendees 1 2 3]
@ashking94 Thanks for filing this issue.